Why restricted site conditions are one of the most common reasons screw piling is specified and what restricted access actually means in practice

Restricted access is one of the most frequently cited reasons for specifying screw piling, but the term covers a wide range of site conditions that each present different practical challenges for a foundation contractor. A restricted site might mean a rear garden extension accessible only through a narrow side passage, an inner city commercial plot surrounded by existing buildings with no room to manoeuvre a large rig, a basement or undercroft with limited headroom, or a site where overhead power lines, underground services, or party wall constraints limit where equipment can operate and how it must be positioned during the works.

What these situations have in common is that the equipment used to install the foundation must be smaller, more manoeuvrable, and more adaptable than what would be used on an open site with unrestricted access. Screw piling is well suited to these conditions because the installation equipment can be configured to match the specific constraints of the site, with compact tracked rigs capable of passing through gaps as narrow as 750mm, low headroom attachments for basement and undercroft work, and remote hydraulic power packs that allow the drive head to operate at a distance from the power source where space around the pile positions is extremely limited.

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